cleanup fixes of solo dungeon queue

src/server/game/World/World.cpp

@@ -1527,6 +1527,8 @@ void World::LoadConfigSettings(bool reload)
         sConfigMgr->GetIntDefault("DungeonFinder.LowPopulation.FallbackDelay", 60);
     m_int_configs[CONFIG_DUNGEON_FINDER_LOW_POPULATION_MIN_PLAYERS] =
         sConfigMgr->GetIntDefault("DungeonFinder.LowPopulation.MinPlayers", 1);
+    m_int_configs[CONFIG_DUNGEON_FINDER_LOW_POPULATION_SOLO_GROUP_OUTSIDE_TIMEOUT] =
+        sConfigMgr->GetIntDefault("DungeonFinder.LowPopulation.SoloGroupOutsideTimeout", 300);
 
     if (m_int_configs[CONFIG_DUNGEON_FINDER_LOW_POPULATION_MIN_PLAYERS] < 1)
     {

src/server/game/World/World.h

@@ -367,6 +367,7 @@ enum WorldIntConfigs : uint8
     CONFIG_LFG_OPTIONSMASK,
     CONFIG_DUNGEON_FINDER_LOW_POPULATION_FALLBACK_DELAY,
     CONFIG_DUNGEON_FINDER_LOW_POPULATION_MIN_PLAYERS,
+    CONFIG_DUNGEON_FINDER_LOW_POPULATION_SOLO_GROUP_OUTSIDE_TIMEOUT,
     CONFIG_MAX_INSTANCES_PER_HOUR,
     CONFIG_WARDEN_CLIENT_RESPONSE_DELAY,
     CONFIG_WARDEN_CLIENT_CHECK_HOLDOFF,